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TOTAL CONTAINMENT <br /> UNDERGROUND STORAGE TANK <br /> k+. <br /> PERIODICAL TANK TEST FOR <br /> ° INTERSTITIAL TIGHTNESS <br /> . Publication No. DWTPTEST01 <br /> ."� Effective Date 1-flay-01 <br /> 4- <br /> q, Supersedes: None <br /> 7l S. <br /> {�� <br /> t, , <br /> V = w4*. <br /> 1 . The vacuum for the test shall be ar r, _ <br /> minimum of 15" of Hg at the start. ,' let:. - <br /> 2. Test period shall be 12 hours for 4 <br /> tanks up to 10,000 gallons and 24 • w ' <br /> hours for tanks greater than 10,000 v <br /> gallons. <br /> 3. Vacuum decreases of less than 5 °� <br /> inches of Hg during test period <br /> indicate that the tank is tight. <br /> 4. Vacuum decreases of more than 5 <br /> inches of Hq during test period <br /> requires further investigation........ �. <br /> n r 31 <br />